<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
<style>
    #wrapper{
        width:30px;
        height:25px;
        position: relative;
    }
    #uploader{
        width:100%;
        height: 100%;
    }
</style>
      <div id="wrapper">
          <input id = "uploader" type="file"/>
      </div>
</body>
</html>